The role of DNA ligase in DNA replication is to
a. add more nucleotides to the growing strand one at a time.
b. open up the two DNA strands to expose template strands.
c. ligate base to sugar to phosphate in a nucleotide.
d. bond Okazaki fragments to one another.
e. remove incorrectly paired bases.
Answer: d. bond Okazaki fragments to one another.
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What is the definition of endocytosis?
A. The transport of large molecules out of the cell. B. The entire plasma membrane turns itself inside out. C. The digestion of larger molecules that were brought into the cell. D. The transport of large molecules into the cell.
The total solute concentration of a solution of water and other substances (salts, proteins, etc.) is referred to specifically as its
A. osmolarity. B. tonicity. C. salinity. D. specific gravity. E. density.
Action potentials are propagated along a(n) ____
a. sodium channel b. axon in two directions c. gated channel d. axon in one direction e. dendrite
What is the role of the apical complex in apicomplexans?
A. The apical complex enables the apicomplexan to penetrate and bore into a host cell. B. The apical complex is a defensive structure that is used to destroy bacteria. C. The apical complex is a motility structure that enables cell movement. D. The apical complex is a feeding structure through which small food particles are taken in.